[PATCH 3.19 081/101] drivers/of: Add empty ranges quirk for PA-Semi

Greg Kroah-Hartman
2015-04-17T13:38:45Z

From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

commit 41d9489319f28f06cf51731131bc353d5a6bce59 upstream.

The "sdc" node is missing the ranges property, it needs to be treated
as having an empty one otherwise translation fails for its children.

Fixes 746c9e9f92dd, "of/base: Fix PowerPC address parsing hack"

Tested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/of/address.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -450,12 +450,17 @@ static struct of_bus *of_match_bus(struc
return NULL;
}

-static int of_empty_ranges_quirk(void)
+static int of_empty_ranges_quirk(struct device_node *np)
{
if (IS_ENABLED(CONFIG_PPC)) {
- /* To save cycles, we cache the result */
+ /* To save cycles, we cache the result for global "Mac" setting */
static int quirk_state = -1;

+ /* PA-SEMI sdc DT bug */
+ if (of_device_is_compatible(np, "1682m-sdc"))
+ return true;
+
+ /* Make quirk cached */
if (quirk_state < 0)
quirk_state =
of_machine_is_compatible("Power Macintosh") ||
@@ -490,7 +495,7 @@ static int of_translate_one(struct devic
* This code is only enabled on powerpc. --gcl
*/
ranges = of_get_property(parent, rprop, &rlen);
- if (ranges == NULL && !of_empty_ranges_quirk()) {
+ if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
pr_debug("OF: no ranges; cannot translate\n");
return 1;
}